SYSTEM: V2.11.3
NUMBER: 462 MODULE: dispcor SYSTEM: V2.11.3 DATE: Tue Feb 1 16:16:57 MST 2000 FROM: valdes BUG: DISPCOR does not work correctly when linearizing spectra if there is more than one aperture in the file (that is multispec format data) and the aperture numbers are different than the line numbers. This was found in the reduction of multifiber data where the aperture numbers are set to the fiber numbers. What happens is that the dispersion solution from the wrong spectrum is applied during the linearizing. There is no indication that the dispersion correction is incorrect. The workarounds are to make sure that the aperture numbers correspond to the line numbers, to separate the spectra into individual 1D format, or to use 'linearize=no'. STATUS: This is a serious bug, particularly since there is no obvious indication of producing the wrong result. A patch to V2.11.3 is required to fix this problem.